Effect of Seasonal Variation on Air Environment Quality of Typical Forest in Suburban Wuhan:A Case of Jiufeng National Forest Park
In order to explore the changes of urban forests air environment,Jiufeng National Forest Park in Wuhan City was taken as the research object,and air negative ion concentration was taken as the main monitoring index to simultane-ously monitor air temperature,humidity,and air particle concentration,etc.,clarify their seasonal change rules,and ex-plore the main factors affecting air negative ion concentration.The results showed that the forest environment could sig-nificantly improve the air temperature and humidity,and the environment of each forest type reached the"body comfort-able"grade in spring and autumn.Compared with the control,each forest type had obvious purifying effect on PM1,PM2.5 and PM10.The rate of particulate matter clearance in autumn was higher than that in summer,and the lowest was in spring.In each season,the particulate clearance rate of coniferous and evergreen broad-leaved forest was higher.The air negative ions concentration presented that summer＞spring＞autumn,and the peak time of negative ion concentration in spring and autumn was mainly focused at 16:00,and it was at 10:00 in summer.There were seasonal differences in the main factors affecting the air negative ions concentration.The concentration of each particulate type matter and canopy sky openness were extremely significantly or significantly negatively correlated with the negative ions concentration in each season.In addition,the air negative ions concentration was significantly positively correlated with air humidity in spring and with tree height in summer.In autumn,it was positively correlated with air temperature,leaf area index and tree height.
forest parkthe human body comfort indexconcentration of particulate matterthe air negative ions concen-trationseasonal influencing factors
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